Haven't touched it honest Using IE10 now, it changed itself automatically and every site I visit I had to log in again so I presume it's something to do with that?But another forum I visit (VBulletin) the pop ups still work.
All you Chrome, Firefox and IE users should try Opera as it is the best browser.
Try it and see But my reasons are ctrl-tab works like alt-tab i.e. latest first, and mouse gestures. There are many lesser reasons and if you try it you will find your own favourite features.
You can right=click anywhere on a page and choose Inspect Element. This is in-built and really neat. I've not used firebug so cannot comment of the differences. Give it a go - you can always uninstall it! Just don't download version 15 - stick to v12.